diff --git a/test/staging/sm/JSON/parse-with-source.js b/test/staging/sm/JSON/parse-with-source.js
index ddcf0130b5..32869059dd 100644
--- a/test/staging/sm/JSON/parse-with-source.js
+++ b/test/staging/sm/JSON/parse-with-source.js
@@ -3,8 +3,6 @@
 
 /*---
 includes: [compareArray.js]
-flags:
-  - noStrict
 description: |
   pending
 esid: pending
@@ -121,11 +119,12 @@ features: [json-parse-with-source]
     assert.sameValue(obj.rawJSON, "false");
 })();
 
-(function checkErrorsComeFromCorrectRealm() {
+// Check errors come from correct realm.
+{
     const otherGlobal = $262.createRealm().global;
     assert.sameValue(TypeError !== otherGlobal.TypeError, true);
 
-    assertErrorComesFromCorrectRealm = (fun, thisRealmType) => {
+    let assertErrorComesFromCorrectRealm = (fun, thisRealmType) => {
         assert.throws(thisRealmType, () => fun(this),
             `${thisRealmType.name} should come from this realm.`);
         assert.throws(otherGlobal[thisRealmType.name], () => fun(otherGlobal),
@@ -142,5 +141,4 @@ features: [json-parse-with-source]
     assertErrorComesFromCorrectRealm((gbl) => gbl.JSON.rawJSON('123\n'), SyntaxError);
     assertErrorComesFromCorrectRealm((gbl) => gbl.JSON.rawJSON('\t123'), SyntaxError);
     assertErrorComesFromCorrectRealm((gbl) => gbl.JSON.rawJSON(''), SyntaxError);
-})();
-
+}